I've not used the 1508.
I do have the sealed Hartke 210XL and a 115XL that when used together actually sound pretty darn good. The 210 isn't bad at all for a low level/volume "practice" rig but it lacks the low end I prefer. As far as the 115XL goes, I don't like it at all as a stand alone.
And out of the combo of the 210 and 115 compared with the 410 you have, which has the most bottom end / punch?